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4.   I agreed with my mother, but my sister____________  (agree).

3.   She ____________  (be) able to ride a bike at the age of five.

2.    There are about two ________   (hundred) people over there. They're watching____________   ( hundred) of birds.

1.    These workers always work in a ______________ (clanger) place.

(       )8.   People never know what ____________  in 100 years.

A.   happen             B. happened

C.   will happen       D.  will be happened

(       )7.   My uncle seemed ____________  after a long walk.

A.   tired          B. tiring

C.   tire            D.   to tired

(       )6.   The boss makes the workers____________  for a long time every day.
A.   worked         B.  to work

C.   work         D. working

(       )5.  - What are you doing now?

 —I am ____________   my key, but I can't find it.

A.   looking at          B.   looking after

C.   looking up         D.   looking for

(       )4.  —How many students are there in your school?

          ―About nine____________  .
       A.  hundred of        B. hundreds

       C.   hundreds of       D. hundred

(       )3.   Robots won't____________  think as people.

A.   can                B. could

C.   be able to          D. is able to